Method of forming electric heater plates



L. M KINNEY METHOD OF FORMING ELECTRIC HEATER PLATES Original Filed May 9, 19 28 INVENTOR. /(lt4 vm,7.;;

ATTORNEYS.

Oct. 21, 1930.

Patented Oct. 2 1, 1930 STATES LON MCKINNEY, on ERIE, PENNSYLVANIA, Assienoft mo 'rnnenIswoLn MANUFAC- TUBING COMPANY, or ERIE, PENnsY v nIA, n conronnrron on PENNSYLVANIA MErHon 0E FORMING ELEc'rnIc nEn'r- PLATES Original application filed May 9, 1928, Serial 110.276,!38. Divided at this application filed. December 11, I

' t 1928. Serial No; 3 25,15 1 I Electric heater plates usualy involve a metallic heating, or radiatingsurface, an electric element and a mounting for the electric element. The present invention'is directed to the method of attaching themounting which is ordinarily of porcelain, orinsulating material, to the heating plate. The present invention is a division of application, Serial Number 276,438, filed May 9th, 1928, electric heat-.

ers and method of forming the same. f

The apparatus throughwhich the method is practiced is illustrated in the accompanying I points of contact.

drawings as follows p Fig. 1 shows a centralsection of an electric heater, this being in the'specific form shown.

, Fig. 2 a bottom view of the hot plate.

- Fig. 3an enlarged'perspective view of one ofthe element supports. v

Fig. 4 a mold showing the manner of se curing the supports to the hot plate. I

1 marks the'heater frame, 2 a closure plate formed on the frame, and 3 a hot plate mounted on the frame above the closure plate. I

A series of insulating electric element sup ports 4 are mounted on the plate 3. These supports have openings 5 through them and are, as shown, arranged circumferentially around the plate and the heating element 6 is threaded through the openings 5, the ends being secured in the terminals 7. p v Each support is provided with sockets 8 extending from one surface of thesupport and these sockets have vent openings!) extending through the opposite face of the support.

In securing the supports to the plate the following method is employed: 10 represents the drag of an ordinary mold flask and 11 the A mold cavity 12 is formed in the sand of thedrag of the mold and cope, this cope.

mold cavity being suitable .to receive the metal forming the hot plate. 'At the same time the pattern has prints corresponding in ets 8 and the cooling of the metal thus se-e cures the supports to the plate. The sockets extending ina perpendicular direction to the plate facilitate this although this is not essential for-all forms of supports. Themetalflowing into these cavities, orsockets, makes a nice fit with the socketslwithout exerting undue strain on any localized point. 'Consequentlythe' insulating supports which are ordi- .narily porcelain and fragile will stand a great deal more pressure, or shock, than with ordinary means of securing such supports where such strains are from necessitylocalized on p The engaging surfaces conform exactlyto the surfaces ofthe" supy ports even though'there may be quite a variation and thu'sthere'is anintimate contact between the supports and-the plate through which there may be-heattransfer from the element to the plate and this intimate relation is also true with relation to heat transfer'by way of the securing plugs, or projections 14. The apparatus, therefore, is stronger than theordinary means of support, the forming f of the mold cavities takes no longer than" it would without the prints for the insulating supports and the placing of the insulating supports requires less time than any ordinary I operation that would secure them to the plate and there is an absence of localizedcontact with the insulating material so that there is less liability of breakage and greater heat transfer than with the common curing such devices.

What I claim as new is f Y 1. The method of forming hot plates with element supports of insulating material which consists in forming a mold having a mold cavity for the plate and prints toreceive the supports, placing insulating supports having metal receiving cavities in the prints. filling the mold with molten metal for methods of sethe plate and uniting the supports with the plate through the engagement of the metal as cast with said walls of said receivingcavities.

2. The method of forming hot plateswith element supports of insulating 7 material which consists in forming a mold having a,

ing metal receiving cavities the printa'filL mold cavity for the plate and prints to receive i the supports, placing insulating supports .hav-

7 surfaces ofthe supports.

walls-of said receiving cavities, and forming a cast surface on the plate cenfermingto the In tetiinbny whereof I havehefeuiitbeet my'hand. V V

as; Q 

